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HAProxy - Load balancer
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qcc_release_remote_stream() is called each time a remote stream is closed. Flow control accounting is updated and when necessary, a MAX_STREAMS_BIDI frame is prepared to allow the peer to initiate new streams. This patch extends stream elasticity features with the QUIC bidirection stream flow control mechanism. The announced value can now be possibly reduced depending on conn_calc_max_streams(). The first step is to decrement closed streams from the global committed extra streams total. This must be performed conn_calc_max_streams() to ensure the calculation will be valid. Then, there is two cases depending on conn_calc_max_streams() result. If the value is less than the peer still remaining stream window, nothing more is performed. If the opposite case, flow control must be increased and a MAX_STREAMS_BIDI frame is prepared, with the value adjusted to not exceed the stream elasticity limit. Global extra streams total is then finally incremented. This calcul also ensures that when all streams are closed, global extra streams accounting operations are decremented by 1, as a connection always has access to one stream which is excluded from the global total. Note that if stream elasticity is not active, flow control increases principle is unchanged and remains statically performed. This patch is labelled as major as it complexifies bidirectional stream flow control mechanisme. This is a sensitive operation as there is a risk of connection freeze if flow control updates are inadvertently skipped. |
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.